Circuit cube



FIG. 1 is a top perspective view of a circuit cube, showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left view thereof; and,

FIG. 7 is a right view thereof.

The broken lines shown in the drawings represent portions of the circuit cube that form no part of the claimed design. 

CLAIM The ornamental design for a circuit cube, as shown and described. 